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Perioperative hypercoagulability in uremic patients: a viscoelastic study
E G Pivalizza1, D C Abramson, A Harvey
1Department of Anesthesiology, University of Texas Health Science Center at Houston 77030, USA.
Journal of Clinical Anesthesia
|September 1, 1997
Summary
Uremic patients undergoing surgery exhibit hypercoagulability, challenging traditional views of platelet dysfunction. Viscoelastic tests reveal a pro-thrombotic state, suggesting a need to reassess coagulation concerns in uremia.
Area of Science:
- Nephrology
- Hematology
- Surgical Anesthesia
Background:
- Chronic kidney disease (CKD) is associated with bleeding complications, leading to a common assumption of coagulopathy.
- However, clinical observations like high rates of arteriovenous graft thrombosis suggest a potential pro-thrombotic state in uremic patients.
Purpose of the Study:
- To investigate whole blood coagulation dynamics in uremic patients undergoing surgery using thromboelastography and the Sonoclot analyzer.
- To compare coagulation parameters between uremic patients and healthy controls.
Main Methods:
- Prospective, observational study involving 30 uremic patients and 30 matched controls undergoing elective surgery.
- Blood samples were analyzed immediately after anesthetic induction using thromboelastography and Sonoclot.
- Key viscoelastic parameters including R time, K time, alpha angle, maximum amplitude, initial slope, and fibrinolysis were assessed.
Main Results:
- Uremic patients demonstrated hypercoagulability compared to controls, evidenced by thromboelastographic indices (R time, K time, alpha angle, maximum amplitude) and Sonoclot parameters (initial slope, time to peak).
- Fibrinolysis was significantly decreased in the uremic group.
- These findings indicate enhanced clot formation and reduced clot breakdown in uremic patients.
Conclusions:
- The study provides in vitro evidence of perioperative hypercoagulability in uremic patients, contradicting the traditional view of platelet dysfunction.
- These findings suggest that uremia may present a pro-thrombotic state, necessitating a re-evaluation of coagulation management strategies.
- Viscoelastic monitoring may offer valuable insights into the complex hemostatic balance in uremic patients.